2781272881 has 4 divisors (see below), whose sum is σ = 2781568372. Its totient is φ = 2780977392.

The previous prime is 2781272863. The next prime is 2781272887. The reversal of 2781272881 is 1882721872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1567447281 + 1213825600 = 39591^2 + 34840^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781272881 - 2²⁹ = 2244401969 is a prime.

It is a super-2 number, since 2×2781272881² = 15470957677172080322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781272887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133146 + ... + 152611.

It is an arithmetic number, because the mean of its divisors is an integer number (695392093).

Almost surely, 2^2781272881 is an apocalyptic number.

It is an amenable number.

2781272881 is a deficient number, since it is larger than the sum of its proper divisors (295491).

2781272881 is an equidigital number, since it uses as much as digits as its factorization.

2781272881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295490.

The product of its digits is 200704, while the sum is 46.

The square root of 2781272881 is about 52737.7747065611. The cubic root of 2781272881 is about 1406.3104385784.

The spelling of 2781272881 in words is "two billion, seven hundred eighty-one million, two hundred seventy-two thousand, eight hundred eighty-one".